Looking at buying a trailer soon for the mini nj (she’s nearly one). Are the basic halfords ones any good or is it worth spending any more? Second hand is fine probably wouldn’t want to spend much more than £100 or so.
Won’t be using offroad probably just local bike paths and parks.

Nothing wrong with the halfords one, if you were going to be doing big miles then it would be worth spending more but for rides you describe its fine. Only issue I can see with it is lack of support when they fall asleep, I cured that with a large cuddly toy for her to lean on. Mine even found use as a cargo trailer for a bike packing trip in Scotland and is now being converted into a flat bed load lugger.